Fast Azimuthal Displacement Retrieval from TOPSAR Burst Overlapping Interferometry: Application in Dronning Maud Land (Antarctica)

Abstract:
Differential SAR Interferometry allows deriving velocity maps only along the line of sight. Bi-dimensional displacement estimation may be overcome using TOPSAR mode acquisition. TOPSAR acquisition mode implies burst-by-burst acquisition with beam steering from backward to forward during burst acquisition. Consecutive bursts have a superposition area to allow proper stitching. In these superposition areas, each point is observed twice with different azimuthal viewing angles (i.e. backward and forward). Burst Overlapping Interferometry (BOI) exploits these superposition areas to extract azimuthal displacements. We present here results of the BOI technique applied on Antarctic ice shelves, i.e. fast-moving area, and propose a filtering algorithm.